Javascript dropdownlist hide/unhide textbox

How do i control a textbox from a dropdownlist value. I need to make a text box visible when a particular vlaue is selected in the dropdownlist box. I basically want to avoid a post back to control this.

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UniqueID is used to read the ID of server controls. My function is read the selected value of DDL and compair the selected value. If the selected value is 'E', display the controls other wise don't display.

Can you please send me the code and .aspx file. It will help me to give you exact code.

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